netdev - Re: [PATCH v5 net-next 24/36] net: Add MSG_DDP

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Message-ID: <CANn89i+xCzwGEbWCu6A2neqFt_SaDK9Y3GVPCTz0Nv0+OrnQiw@mail.gmail.com>
Date:   Thu, 22 Jul 2021 16:23:52 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Boris Pismenny <borisp@...dia.com>
Cc:     David Ahern <dsahern@...il.com>, Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Saeed Mahameed <saeedm@...dia.com>,
        Christoph Hellwig <hch@....de>, sagi@...mberg.me, axboe@...com,
        kbusch@...nel.org, Al Viro <viro@...iv.linux.org.uk>,
        smalin@...vell.com, boris.pismenny@...il.com,
        linux-nvme@...ts.infradead.org, netdev <netdev@...r.kernel.org>,
        benishay@...dia.com, ogerlitz@...dia.com, yorayz@...dia.com
Subject: Re: [PATCH v5 net-next 24/36] net: Add MSG_DDP_CRC flag

On Thu, Jul 22, 2021 at 1:06 PM Boris Pismenny <borisp@...dia.com> wrote:
>
> From: Yoray Zack <yorayz@...dia.com>
>
> if the msg sent with this flag, turn up skb->ddp_crc bit.
>
> Signed-off-by: Yoray Zack <yorayz@...dia.com>

Ok, but why ?

How would you document in linux manpages the purpose of this flag ?

How can applications be sure the kernel they run on is actually
supporting this flag ?
Maybe it is a hint only ?